Researchers at Australian start-up Cortical Labs have taught human neurons grown on a chip to play the classic Doom game. In 2021, they had already used 800,000 neurons to play Pong. Now, with four times fewer brain cells, they can play a much more complicated game. … The technology making this possible is the CL-1, a “biological computer” chip. The biological component of the CL-1 system consists of human neurons derived from induced pluripotent stem cells (iPSCs). These cells, typically repurposed from adult skin or blood samples, are differentiated in a lab into functional cortical neurons. Once matured, approximately 200,000...